Improvement in heating-furnaces



UNITED STATES PATENT QFFIGE.

ADOLPHUS F. BISHOP AND JOHN H. AIKEN, OF NORVVALK, CONNECTICUT.

IMPROVEMENT IN HEATING-FURNACES.

Specification for ming part of Letters Patent No. 155.85 1, datedOctober 13,1874; application filed July 25,1874.

To all whom it may concern Be it known that we, ADOLPHUS 1 BIsHoP andJOHN H.AIKEN, ofNorwalk, in the county of Fairfield and State ofConnecticut, have invented a new and Improved Heating-Furnace, of whichthe following is a specification:

The object of our invention is to provide an improved and efficientapparatus to supply air to inhabited buildings pure and unvitiated andunchanged in all its conditions from its original state, except that itis heated. The said apparatus consists of a boiler, which, forconvenience sake, we arrange as vertical in position, and because in agreat majority of cases it will be so placed, said boiler containingwithin air-chambers, generally two in number, and placed at or near theextreme ends of the cylinder, the faces of which (inner and outer) willbe concentric rims, parallel to the cylinder of the boiler, and havingtheir remaining sides at right angles to the rims, and generally flat,said chambers being connected by air-tubes (one or more rows of themparallel to the cylinder) extending between the air-chambers all the wayround, except in front, where the firedoors are; and in a considerablecentral space not occupied by these tubes and chambers, but which isbounded by lines drawn across the inner faces of the chambers, is placeda'furnace or fire-pot, and an ash-pit beneath, the latter extending to,or nearly to, the floor, and above the furnace, and of the same, ornearly the same, horizontal dimensions as the latter, is placed asmoke-chamber, which will be contained wholly within the cylinder, ormay extend above and through it, from which the smoke-pipe will proceedto the chimney-flue. The roof of the furnace consists of a flue-sheet,out of which will rise fire-tubes, which will connect the furnace withthe smoke-chamber. The

furnace, air and fire tubes, air an d smoke-chamas may be found usefulmaybe placed at distances apart between the upper and lower chambers.These, though increasing the cost of construction, will augment thereservoir capacity, or capacity for storing air. and admit of a slowertransmission of the air, by which it will acquire more heat and volume.The air and fire tubes will be sufficiently apart to permit an easycirculation of the water between, around, and among them.

To further facilitate the water circulation a few outside pipes may beused to enter the boiler at or near the top and bottom.

As a means of further heating the air we propose, in some cases, tosurround the cylin der with a metal case or wall to be closed at the topagainst the sides of the cylinder, and thus create a chamber of a fewinches width, into which the air will be first received. From thischamber the air will enter through the cylinder into the lowerair-chamber at one or more points, whence it will rise through theair-tubes to the upper air-chamber, and through the intervening ones, ifthey be used, and thence to'the register-pipes. Water will fill allspaces within the boiler not occupied by chambers, tubes, and furnace,and will be supplied through means of any sufficient self-operatingarrangement connected with the pipe system of the building, or in townswhere there is no public water it will be supplied by any practicablemeans.'

As water will. be the only immediate heating agent no steam pressurewill ever be generated, as the steam will have unobstructed exit bymeans of a pipe which will convey it beneath the grate, or to acondenser, or in part to the air-chambers, to supply moisture to theair.

Each complete apparatus will be subjected to hydrostatic pressure toprove perfect c011- struction.

The firetubes may be readily swept by lifting off a cover provided overthem.

When repairs are needed the apparatus will be laid on its side, andfurnace, fire-tubes, and smoke-ch amber, constitutingthefire-section onthe air-chamber, and air-chambers be drawn out to afi'ord access to theinterior.

Figure 1 is a sectional elevation of our improved water air-heater,taken on the line as m of Fig. 2. Fig. 2 is a horizontal section takenon the line y yof Fig. 1. Fig. 3 is a section of the outer air-jacket,the feeder, and a portion of the top of the boiler; and Fig. 4 is asectional elevation of Fig. 3 taken on. the line 2 2.

Similar letters of reference indicate corresponding parts.

A is the outside shell of the boiler; B, the bottom; 0, the top; D, theshell around the fire-pot; E, the air-chambers; F, the air-tubes G, theouter air receiving-jacket; H, the firetubes; I, the tube-sheet at thebase of the smoke-flue J, the smoke-flue; K, opening to fire-pot; L,opening to ash-pit; M, inlet for cold air; N, inlet for" air to lowerchambers; O, conductors for hot air; P, feed-tank; and Q, pipe forconducting steam, in case any is generated, into the fire to be burned,or into the feed-tank to be condensed. This feed-tank will contain afloat-regulator and a valve for maintaining the water at the properheight in the boilers. The air-chambers E and tubes F are fitted in theboiler and around the furnace trally located fire-pot, thesmoke-chambers J,

the connecting fire-tubes H, the all-embracing Water-reservoir A, andthe outer enveloping jacket G, all constructed and arrangedsubstantially as shown, and forthe purpose de-.

scribed.

A'DOLPHUS F. BISHOP. JOHN H. AIKEN.

Witnesses:

CHARLES L. GLOVER, WILLIAM E. MONTGOMERY.

